Coreless roll component and coreless paper roll

Abstract

To provide a coreless roll component that allows a coreless paper roll set in a printer to maintain its shape and be pulled out smoothly, and that does not allow the coreless paper roll to fall off the shaft after it has been used up.SOLUTION: A coreless roll has a first notch 7a provided at a distance d1 from one short side 6a of a rectangular sheet body s2, a second notch 7b provided at a distance d2 from the other short side 6b, a first blade portion 8a between the first notch 7a and the short side 6a, and a second blade portion 8b between the second notch 7b and the short side 6b. The sum of the lengths of the first and second notches 7a and 7b is equal to the length of the short side 6a, and the distance L5 between the first and second notches 7a and 7b is less than the inner circumference of the center hole of the coreless roll body. The sheet body s2 is fitted into the center hole in a cylindrical shape by fitting the first and second notches 7a, 7b together so that the first and second blade portions 8a, 8b are positioned on the outer periphery side.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] This invention relates to a member for coreless roll paper and coreless roll paper.

Background Art

[0002] Many roll papers used in printers have a paper tube formed of cardboard at the center. In recent years, however, for the purpose of reducing manufacturing costs and waste, the use of coreless roll paper without a paper tube has been considered. In coreless roll paper without a paper tube, the inner circumference of the central hole is formed at the starting part of the long paper winding.

[0003] Similar to general roll paper, the coreless roll paper as described above is used by being mounted in the storage part of a printer. When the long paper is pulled out, the coreless roll body rotates in the storage part of the printer. However, when the shaft of the printer is inserted into the central hole of the coreless roll paper and used, the base end side of the long paper may be wound around the shaft inside the central hole, making it impossible to pull out the paper.

[0004] Also, in a storage part that supports the outer circumference of the coreless roll body and rolls it without using a shaft, the outer shape of the coreless roll body may be deformed together with the central hole due to vibration during use. If the coreless roll body is deformed and the cross-sectional shape is no longer circular, it becomes impossible to smoothly pull out the paper.

[0005] Therefore, it is also known to try to maintain the shape of the coreless roll body by applying glue to the side surface of the roll body (see Patent Document 1), or to provide a special jig for coreless roll paper in the printer (see Patent Document 2).

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] By the way, instead of the special member as in Patent Document 2 above, a member for a coreless roll using a resin sheet s1 as shown in FIG. 6 can also be considered. The sheet body s1 constituting this member for a coreless roll has the length L1 of the long side made longer than the inner circumference of the center hole 2 of the coreless roll body R (see FIG. 1), and the length L2 of the short side made equal to the width W1 of the coreless roll body R. The rectangular sheet body s1 is formed into a sheet roll 3 wound as shown in FIG. 7 and inserted into the center hole 2, and the printer shaft 4 is inserted therein as shown in FIG. 8 for use. The member for a coreless roll composed of this sheet roll 3 can maintain the shapes of the center hole 2 and the coreless roll body R because the sheet body s1 adheres closely to the inner circumference of the center hole 2 due to the rigidity of the sheet body s1 when the sheet body s1 tries to expand.

[0008] The member for a coreless roll composed of the sheet roll 3 shown in FIGS. 7 and 8 has a simple structure and can be provided at low cost. However, when such a member for a coreless roll is attached to the roll body R and the printer shaft 4 is inserted as shown in FIG. 8 for use, when the long printing paper 1 is used up, the sheet body s1 expands due to its own rigidity. If the sheet roll 3 expands, the sheet body s1 will fall off from the printer shaft 4. It is conceivable that the fallen sheet body s1 will fall outside the printer or get caught in other parts inside the printer. Therefore, every time the long paper is used up, the fallen sheet body s1 must be picked up, which may cause a problem that the workability in the printing process deteriorates.

[0009] An object of the present invention is to provide a coreless roll member and a coreless roll paper that can stably and smoothly draw out a long sheet when housed and used in a printer, and that do not fall off from the shaft of the printer after use and reduce workability.

Means for Solving the Problems

[0010] The coreless roll member of the first invention is a coreless roll member that is mounted on a coreless roll body formed with a cylindrical center hole by winding a long sheet for a printer in a band shape and is mounted on a storage portion for printing paper of a printer. It has a substantially rectangular sheet body having a long side longer than the circumference of the cross-sectional circle of the center hole, and is provided at a position maintaining a predetermined distance from one short side of the rectangle to the inside of the rectangle. A first cut extending from one long side of the rectangle toward the other long side facing it, and provided at a position maintaining a predetermined distance from the other short side facing the one short side to the inside of the rectangle. A second cut extending from the other long side of the rectangle toward the one long side, a first blade portion that is a region between the first cut and the one short side, and a second blade portion that is a region between the second cut and the other short side. The sum of the lengths of the first cut and the second cut is set to be equal to the length of the short side, and the interval between the first cut and the second cut in the long side direction of the rectangle is set to be less than the circumference of the inner circumferential circle of the center hole. The sheet body is fitted into the center hole in a cylindrical state between the first cut and the second cut in the long side direction of the rectangle so that the first blade portion and the second blade portion are located on the outer peripheral side.

[0011] In the second invention, the lengths of the first and second cuts are equal.

[0012] In the third invention, the sheet body is made of a resin sheet having a thickness of 0.2 [mm] or more.

[0013] The coreless roll paper of the fourth invention includes a coreless roll body in which a long strip of printer paper is wound to form a cylindrical center hole and is housed in the paper storage part of the printer, and the coreless roll member of the first invention attached to the center hole.

Advantages of the Invention

[0014] According to the first invention, the blade parts of the sheet member expand in the diameter-expanding direction due to rigidity and adhere to the inner circumference of the center hole of the coreless roll body. Therefore, it is possible to prevent the loosening of the long paper in the center hole and the deformation of the center hole. Since the shape of the center hole can be maintained, the shape of the entire coreless roll body can also be maintained. Therefore, even without a printer equipped with a special jig, the long paper can be stably pulled out from the coreless roll body set in the printer. In other words, the usage scenarios of the coreless roll paper can be expanded. In addition, since the first cut and the second cut of the sheet body are fitted together, the cylindrical shape is maintained even when the long paper is used up, and the coreless roll member does not fall off from the shaft of the printer. Therefore, there is no need to search for or pick up the dropped coreless roll member, and the workability of the printing process is not reduced.

[0015] According to the second invention, since the lengths of the first and second cuts are equal, a well-balanced cylindrical shape can be formed when they are fitted together. As a result, the first and second blade parts evenly press the inside of the center hole of the coreless roll body, and the shape of the coreless roll body is surely maintained.

[0016] According to the third invention, the sheet body has sufficient rigidity, and the blade parts of the coreless roll member are pressed against the center hole of the coreless roll body, preventing the reduction of the diameter of the center hole.

[0017] According to the fourth invention, it is possible to provide a coreless roll paper that can be set in a printer and used without problems, and moreover, does not reduce workability.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

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Figure 8

BEST MODE FOR CARRYING OUT THE INVENTION

[0019] [Embodiment] An embodiment of the present invention will be described below. FIG. 1 is a perspective view of a coreless roll paper according to an embodiment. FIG. 2 is a plan view of a sheet body s2 constituting a member for a coreless roll according to the embodiment, and FIG. 3 is a side view of the member for a coreless roll according to the embodiment. Further, FIG. 4 is a perspective view of a housing portion of a printer in which a coreless roll paper according to the embodiment is set, and FIG. 5 is a schematic view of the coreless roll paper according to the embodiment set on a shaft 4 of the printer. Note that printing by the above printer includes those that do not form a plate, such as an inkjet printer, and the display target is not limited to characters.

[0020] As shown in FIG. 1, the coreless roll paper of the embodiment includes a coreless roll body R (hereinafter referred to as "roll body R") around which a long paper 1 for printing is wound, and a coreless roll member having a cylindrical portion 9 made of a sheet body s2 inserted into its cylindrical center hole 2. The coreless roll member of this embodiment is composed of a rectangular resin sheet body s2 as shown in FIG. 2 and is inserted into the center hole 2 of the roll body R.

[0021] The sheet body s2 is a rectangular sheet made of resin such as polypropylene with a thickness of about 0.25 [mm]. The lengths L3 of the long sides 5a and 5b of the rectangular sheet body s2 are longer than the circumference of the center hole 2 of the roll body R. For example, the length is 1.5 times the circumference of the cross-sectional circle of the center hole 2, and the lengths L4 of the short sides 6a and 6b are equal to the axial length of the roll body R, that is, the width W1 of the long paper 1.

[0022] Furthermore, the sheet body s2 is provided with a first cut 7a extending from one short side 6a to the other long side 5b facing it at a position maintaining a predetermined distance d1 from the inside of the rectangle. Also, a second cut 7b extending from the other long side 5b to the one long side 5a facing it is provided at a position maintaining a predetermined distance d2 from the inside of the rectangle from the other short side 6b facing the short side 6a. And the region between the first cut 7a and one short side 6a becomes the first blade portion 8a, and the region between the second cut 7b and the other short side 5b becomes the second blade portion 8b.

[0023] Note that the lengths of the first cut 7a and the second cut 7b are made equal, and their sum is set to be equal to the lengths of the short sides 6a and 6b. That is, the first and second cuts 7a and 7b extend from the long sides 5a and 5b to the positions corresponding to the centers of the short sides 6a and 6b, respectively. Further, the distance L5 between the first cut 7a and the second cut 7b in the long side direction is set to be less than the circumferential length of the inner peripheral circle of the central hole 2 of the roll body R. This distance L5 becomes the outer peripheral length L5 of the cylindrical portion 9 which will be described later. Note that the above length L5 is the length obtained by subtracting the sum (d1 + d2) of the distance d1 and the distance d2 from the length L3. The sheet body s2 configured in this way is made into a coreless roll member shown in Fig. 3 in a cylindrical shape by fitting the first cut 7a and the second cut 7b so that the first blade root portion 8a and the second blade root portion 8b are located on the outer peripheral side.

[0024] This coreless roll member projects the first and second blade root portions 8a, 8b in the outer diameter direction from the cylindrical portion 9. These first and second blade root portions 8a, 8b are separated from the outer surface of the cylindrical portion 9 due to their own rigidity. Also, since the outer peripheral length L5 of the cylindrical portion 9 is set to be less than the circumferential length of the inner peripheral circle of the central hole 2, the diameter of the cylindrical portion 9 is smaller than the diameter of the central hole 2 of the roll body R.

[0025] The first and second blade root portions 8a, 8b are arranged along the outer surface of the cylindrical portion 9 formed as shown in Fig. 2, and the cylindrical portion 9 and the first and second blade root portions 8a, 8b are integrated and inserted into the central hole 2. The roll body R of Fig. 1 into which the cylindrical portion 9 is inserted is the coreless roll paper of the present invention. Note that by making the diameter of the cylindrical portion 9 smaller than the diameter of the central hole 2, it is possible to easily insert the cylindrical portion 9 into the central hole 2. However, in the state where the cylindrical portion 9 is inserted, the first and second blade root portions 8a, 8b must maintain a dimensional relationship in which they contact the inner periphery of the central hole 2 and exert a pressing force on the inner periphery.

[0026] [Operation, effect, etc.] As described above, the cylindrical portion 9 inserted into the central hole 2 and the first and second blade root portions 8a, 8b are used by setting the roll body R in which the cylindrical portion 9 is in close contact with the central hole 2 in the printing paper storage portion of the printer. The storage portion of the printer provided with the shaft 4 is composed of, for example, a holder H provided with the shaft 4 as shown in Fig. 4. This holder H includes a shaft 4, a support plate 10 detachably attached to one end side of the shaft 4, and a support plate 11 fixed to the other end side. First, remove the support plate 10 from one end of the shaft 4, and insert the shaft 4 into the cylindrical portion 9 mounted in the central hole 2 of the roll body R. Then, by fixing the support plate 10 to the shaft 4, the roll body R is set on the printer via the holder H.

[0027] In this way, when the shaft 4 is inserted into the central hole 2, as shown in FIG. 5, the resin cylindrical portion 9 made of the sheet body s2 directly contacts the shaft 4. Since the tips of the cylindrical portion 9 and the first and second blade portions 8a, 8b contact the inner periphery of the central hole 2, the shaft 4 and the long paper 1 do not directly contact each other. Therefore, the long paper 1 will not wrinkle, unwind, or fray at the inner peripheral portion of the central hole 2 due to friction. FIG. 5 is a schematic view of the roll body R of this embodiment, focusing on the periphery of the central hole 2. In this figure, the thicknesses of the sheet body s2 and the long paper 1 are greatly represented, and the portion where the long paper 1 is wound in multiple layers is omitted.

[0028] In this embodiment, as shown in FIG. 5, the cylindrical portion 9 and the first and second blade portions 8a, 8b formed of the sheet body s2 contact the inner peripheral surface of the central hole 2 of the roll body R, and due to their rigidity, the first and second blade portions 8a, 8b and the cylindrical portion 9 apply an elastic force in the diameter-expanding direction to the inner periphery of the central hole 2, so that the reduction in the diameter of the central hole 2 can be prevented. Therefore, the shape of the roll body R can be maintained even when the long paper 1 is being pulled out. Also, even after all of the long paper 1 has been pulled out, since the cylindrical portion 9 is maintained with both ends of the sheet body s2 connected to each other, the sheet body s2 does not fall off the shaft 4. Therefore, there is no need to search for or collect the fallen sheet body s2. As a result, the workability of the printing process is not reduced.

[0029] In this embodiment, since the lengths of the first cut 7a and the second cut 7b are equal, when the two are fitted together, it is easy to maintain the axial balance of the cylindrical portion 9. In particular, when the axial length of the roll body R is long, it is effective because the pressing force does not change partially. As a result, the shape of the coreless roll body is surely maintained. However, there may be a slight difference in their lengths.

[0030] Also, if the distances d1 and d2 from the short sides 6a and 6b to the first and second cuts 7a and 7b are too small, the pressing force on the inner peripheral surface of the central hole 2 by the first and second blade portions 8a and 8b will become weak, and if they are too large, it will be difficult to insert them into the central hole 2. Therefore, the distances d1 and d2 need to be appropriately set according to the inner diameter of the central hole 2 and the outer diameter of the cylindrical portion 9. However, in order to sufficiently exert the elastic force of the resin sheet having a thickness of about 0.25 [mm] as described above and to enable smooth insertion into the central hole 2, the distances d1 and d2 are suitably about 15 [mm] to 20 [mm].

[0031] As described above, by using the coreless roll member of this embodiment, the coreless roll paper can be set and used in a printer having a shaft regardless of the presence or absence of a special jig. In other words, the usage scenes of the coreless roll paper can be expanded. The above coreless roll member can be easily formed from a resin sheet. For example, if an unused clear file is used, material costs can be saved.

[0032] Moreover, since it can be repeatedly inserted into the central hole 2 and used, it is not necessary to prepare the number of roll bodies R. For example, even in the case where a plurality of coreless roll papers are sold in a set, as long as at least one of the coreless roll papers in the set is provided with the coreless roll member, the coreless roll member can be reused with other coreless roll papers.

[0033] Moreover, since the cardboard paper tube can be omitted, the manufacturing cost of the roll body R can be reduced. Also, the disposal of the unnecessary paper tube can be reduced. For example, 1000 paper tubes with a diameter of 40 [mm], a length of 60 [mm], and a thickness of 2 [mm] weigh 11.8 [kg]. Accordingly, the corresponding amount of waste can be reduced. Furthermore, since the roll body R is also lightened, there are advantages in transportation.

[0034] In this way, along with the reduction of manufacturing, disposal, and transportation costs, the reduction of CO2 associated with them can also be expected. Also, in the above embodiment, the sheet roll 3 is formed of the polypropylene sheet body s2 having a thickness of about 0.25 [mm]. However, the sheet body s2 only needs to maintain a cylindrical shape and have the rigidity such that the first and second blade portions 8a, 8b naturally spread outward from the cylindrical portion 9, and the material and thickness are not limited to those of the above embodiment. Since the rigidity of the sheet body s2 increases as the thickness increases, in order to form the first and second blade portions 8a, 8b that naturally spread, the thickness of the sheet body s2 is preferably 0.2 [mm] or more regardless of the type of resin.

Industrial Applicability

[0035] The use of the coreless roll paper for printers can be expanded.

Explanation of Reference Numerals

[0036] R (coreless) roll body s2 sheet body 1 (long paper for printer) 2 center hole 5a, 5b one, the other long side 6a, 6b one, the other short side 7a, 7b first, second cut 8a, 8b first, second blade portion 9 cylindrical portion d1, d2 distance (from short side) L3 length of long side L4 length of short side L5 distance (between cuts), length

Claims

1. A coreless roll member to be attached to a coreless roll body around which a long sheet for a belt-shaped printer is wound to form a cylindrical center hole and which is attached to a storage portion for printing paper of the printer, a substantially rectangular sheet body having a long side longer than the circumference of the cross-sectional circle of the center hole, provided at a position maintaining a predetermined distance from one short side of the rectangle to the inside of the rectangle, a first cut extending from one long side of the rectangle toward the other long side facing it, provided at a position maintaining a predetermined distance from the other short side facing the one short side to the inside of the rectangle, a second cut extending from the other long side of the rectangle toward the one long side, a first blade portion which is a region between the first cut and the one short side, and a second blade portion which is a region between the second cut and the other short side, comprising: setting the sum of the length of the first cut and the length of the second cut to be equal to the length of the short side, and setting the interval between the first cut and the second cut in the long side direction of the rectangle to be less than the circumference of the inner circumferential circle of the center hole, the sheet body is fitted with the first cut and the second cut so that the first blade portion and the second blade portion are located on the outer peripheral side, and is mounted in the center hole in a cylindrical state between the first cut and the second cut in the long side direction of the rectangle, a coreless roll member.

2. The lengths of the first and second cuts are equal The coreless roll member according to claim 1.

3. The sheet body is made of a resin sheet having a thickness of 0.2 [mm] or more The coreless roll member according to claim 1 or 2.

4. A coreless roll body around which a long paper for a belt printer is wound to form a cylindrical central hole and is housed in a storage portion for printing paper of the printer, The member for a coreless roll according to claim 1, A coreless roll paper comprising the same.

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